Which of the following are optically active?
Name the following:
c. 
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Key Concepts
Chirality
R and S Configuration
Functional Groups
Draw the structure for a compound with molecular formula C2H2I2F2
c. that is optically active.
Which of the following has an achiral stereoisomer?
e. 1,3-dibromocyclobutane
f. 2,4-dibromopentane
Which of the following has an achiral stereoisomer?
i. 1,2-dimethylcyclopentane
j, 1,2-dimethylcyclobutane
For many centuries, the Chinese have used extracts from a group of herbs known as ephedra to treat asthma. A compound named ephedrine has been isolated from these herbs and found to be a potent dilator of air passages in the lungs.
a. How many stereoisomers does ephedrine have?
b. The stereoisomer shown here is the one that is pharmacologically active. What is the configuration of each of the asymmetric centers?
Which of the following has an achiral stereoisomer?
a. 2,3-dichlorobutane
b. 2,3-dichloropentane
